2145236240 has 80 divisors (see below), whose sum is σ = 5732311680. Its totient is φ = 731366400.

The previous prime is 2145236167. The next prime is 2145236251. The reversal of 2145236240 is 426325412.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89540 + ... + 110940.

It is an arithmetic number, because the mean of its divisors is an integer number (71653896).

Almost surely, 2^2145236240 is an apocalyptic number.

2145236240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2145236240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2866155840).

2145236240 is an abundant number, since it is smaller than the sum of its proper divisors (3587075440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2145236240 is a wasteful number, since it uses less digits than its factorization.

2145236240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21600 (or 21594 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 2145236240 is about 46316.6950461710. The cubic root of 2145236240 is about 1289.7089341908.

The spelling of 2145236240 in words is "two billion, one hundred forty-five million, two hundred thirty-six thousand, two hundred forty".